Multiplication study device

Abstract

A multiplication study device for teaching a student multiplication skills by operation of push-buttons mounted in a box-shaped case. The push-buttons are each provided with a semi-transparent see-through surface which permits the appearance therethrough of an answer to a multiplication problem when the push-button is depressed so as to come into contact with a projecting member disposed therebelow. A plurality of the push-buttons are mounted in the case, and the case includes a rear cover for mounting the projecting members. A common resilient member in the form of a urethane plate is employed for normally urging the push-buttons in an upward direction.

I claim: 
     
       1. A multiplication study device, comprising: a case provided with a plurality of holes penetrating therethrough;   a plurality of substantially hollow push-buttons having opened rear sides, each said push-button being adapted to move up and down through a respective one of said holes;   each said push-button having at least a part of the upper surface thereof formed as a substantially semi-transparent see-through surface;   a plurality of projecting members respectively disposed on the rear side of respective ones of said push-buttons for slidably supporting and guiding said push-buttons;   each said projecting member having a multiplication answer marked on that portion of the top surface thereof which faces said see-through surface of said push-buttons;   a resilient member for urging said push-buttons to move upwardly along said projecting members; and   whereby pressing down of said push-button against the force of said resilient member causes the upper surface of said push-button to approach and contact the top of said projecting member such that said multiplication answer marked on the top of said projecting member appears through said see-through surface of said push-button.   
     
     
       2. A multiplication study device according to claim 1, wherein: said device includes eighty-one of said holes in said case, eighty-one of said push-buttons, and eighty-one of said projecting members.   
     
     
       3. A multiplication study device according to claim 2, wherein: said case is formed into a box having an open rear side;   a rear member is fitted to said case so as to cover said open rear side thereof; and   said eighty-one projecting members are formed integrally with said rear member and project toward the surface of said case.   
     
     
       4. A multiplication study device according to claim 3, wherein: said resilient member comprises a urethane plate of substantially constant thickness;   said urethane plate is provided with eighty-one holes formed therethrough at locations corresponding to the locations of said eighty-one projecting members so as to receive said projecting members; and   said urethane plate is affixed to the surface of said rear member having projecting members integrally formed therewith such that the lower ends of each said push-button contacts the upper surface of said urethane plate.   
     
     
       5. A multiplication study device according to claim 1 or 2, wherein: each said push-button has said see-through surface provided at one portion of the upper surface thereof, with the remaining portion of the upper surface thereof having a multiplication problem corresponding to said answer marked thereon.   
     
     
       6. A multiplication study device according to claim 1, wherein: a multiplication problem is marked on the surface of said case for each said push-button.